[lfs-support] Build directory for gcc.

[Hazel Russman]

Just out of interest, I've been reading gcc's own build instructions and was surprised to find this:

"First, we highly recommend that GCC be built into a separate directory from the sources which does not reside within the source tree. This is how we generally build GCC; building where srcdir == objdir should still work, but doesn’t get extensive testing; building where objdir is a subdirectory of srcdir is unsupported."

That seems to mean that using a build subdirectory, as LFS does, is worse than simply staying in the toplevel one. Obviously it hasn't caused problems for anyone on this list but I'm curious to know why the devs chose to do it this way.
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Hazel Russman
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[Pierre Labastie]

Post by Hazel Russman
"First, we highly recommend that GCC be built into a separate directory from the sources which does not reside within the source tree. This is how we generally build GCC; building where srcdir == objdir should still work, but doesn’t get extensive testing; building where objdir is a subdirectory of srcdir is unsupported."
That seems to mean that using a build subdirectory, as LFS does, is worse than simply staying in the toplevel one. Obviously it hasn't caused problems for anyone on this list but I'm curious to know why the devs chose to do it this way.

Thread starting at
http://lists.linuxfromscratch.org/pipermail/lfs-dev/2016-January/070725.html.
I think the doc is not accurate at all in this respect:
- building in a subdirectory works (obviously).
- building with srcdir == objdir doesn't (see my posts in the above thread).

Regards
Pierre
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A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
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